Valentine Geyser in the Norris Geyser Basin in Yellowstone National Park unexpectedly sprang to life again with 13 documented ...

A surprise eruption that shot steam, water and dark-colored rock and dirt dozens of feet into the sky Tuesday sent people running for safety in Yellowstone National Park. The hydrothermal explosion ...

Valentine Geyser's activity in the day of love remains under wraps because of park regulations.

The Beehive Geyser in Yellowstone National Park is known for its towering eruptions, but also its irregularity in terms of when these eruptions occur. But as the Yellowstone Safari Company explained ...

A geyser explosion in Yellowstone National Park sent dozens of visitors running Tuesday morning, officials said. Videos taken of the event show the dramatic moment, with water and debris raining down ...

Add Yahoo as a preferred source to see more of our stories on Google. Tourists traveling by plane over Yellowstone National Park on Thursday were treated to a rare and magnificent view of the world’s ...

Yellowstone National Park sits atop one of the most studied volcanic systems on Earth, and the question of what a full-scale caldera-forming eruption would do to the United States draws enormous ...

Melissa Block talks to a Yellowstone park visitor who was lucky enough to see Steamboat Geyser erupting for the first time in eight years. Yellowstone Geyser Erupts After Years Of Silence MELISSA ...

The bulge first appeared in 1996 and has now returned, but Yellowstone Volcano Observatory says there's no cause for alarm.